package com.qk.filter;

import com.qk.utils.CurrentUserHoler;
import com.qk.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;

@Slf4j
@WebFilter(urlPatterns = "/*")
public class TokenFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //1.获取请求路径
        String path_uri =request.getRequestURI();//  /login

        //2. 判定是否是登录请求，，如果是，放行
        if (path_uri.contains("/login")){
            log.info("登录请求:{},放行",path_uri);
            filterChain.doFilter(request,response);
            return;
        }

        //3，获取请求头 token
        String jwt=request.getHeader("token");

        //4，判断token是否存在，如果不在，响应401状态码
        if (jwt==null || jwt.isEmpty()){
            log.info("请求头token不存在");
            response.setStatus(401);
            return;
        }

        //5，解析令牌，如果解析令牌报错，响应401状态码
        try {
            Claims claims = JwtUtils.parseToken(jwt);
            Integer userId = claims.get("id", Integer.class);
            log.info("当前用户id：{},存入ThreadLocal",userId);
            CurrentUserHoler.setCurrentUser(userId);

        } catch (Exception e) {
            log.info("令牌解析失败");
            response.setStatus(401);
            return;
        }


        //6.放行
        filterChain.doFilter(request,response);

        //7释放资源
        log.info("删除ThreadLocal中的登录用户信息");
        CurrentUserHoler.removeCurrentUser();
    }
}
